1856639669463 has 12 divisors (see below), whose sum is σ = 2681827364008. Its totient is φ = 1237753083600.

The previous prime is 1856639669431. The next prime is 1856639669513. The reversal of 1856639669463 is 3649669366581.

1856639669463 is a `hidden beast` number, since 1 + 85 + 66 + 396 + 69 + 46 + 3 = 666.

It is not a de Polignac number, because 1856639669463 - 2⁵ = 1856639669431 is a prime.

It is a super-2 number, since 2×1856639669463² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1856639669391 and 1856639669400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1856639669663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1663581 + ... + 2545737.

Almost surely, 2^{1856639669463} is an apocalyptic number.

1856639669463 is a deficient number, since it is larger than the sum of its proper divisors (825187694545).

1856639669463 is a wasteful number, since it uses less digits than its factorization.

1856639669463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116014 (or 1116011 counting only the distinct ones).

The product of its digits is 906992640, while the sum is 72.

The spelling of 1856639669463 in words is "one trillion, eight hundred fifty-six billion, six hundred thirty-nine million, six hundred sixty-nine thousand, four hundred sixty-three".